JP6019733B2 - Electric oil pump device - Google Patents

Description

  The present invention relates to an electric oil pump device.

  Conventionally, a specific example of an electric oil pump device includes a combination of an oil pump that circulates fluid (oil) and an electric motor that drives the oil pump. There has also been proposed an electric oil pump device in which an electric motor is provided adjacent to the pump housing, and a controller for motor control is arranged adjacent to the electric motor in the central axis direction with respect to the oil pump (for example, Patent Documents). 1). In this electric oil pump device, an oil pump, an electric motor, and a controller are arranged side by side in the central axis direction of the oil pump, and a control board of a controller on which electronic components are mounted is mounted in a motor housing that houses the electric motor. Yes.

JP 2010-112302 A

  In the electric oil pump device as described above, a connector for connecting the control board of the controller and the external power supply side is provided, and the connector terminal housed in the connector is inserted and connected to the through hole of the control board. It is necessary to accurately position the control board with respect to the connector terminal. However, if the control board is integrally fixed to the resin insulator forming the stator of the electric motor, the connector terminal and the control board are positioned via other components, so the connector terminal and the control board In some cases, misalignment of the control board may occur, resulting in poor assembly of the control board. Therefore, it is necessary to ensure the processing accuracy of each component in order to assemble the control board with high accuracy, which may increase manufacturing costs such as manufacturing man-hours and equipment costs. The same applies when the control board is attached to a cage that supports a bearing on the opposite side of the oil pump of the rotating shaft of the electric motor.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric oil pump device that can reduce the manufacturing man-hours of an integrated electric motor and controller and reduce the manufacturing cost. is there.

In order to solve the above-mentioned problems, the invention according to claim 1 is a metal oil in which a pump rotor is rotatably supported around a rotation axis in a pump chamber formed between a pump plate and a pump housing. A pump, an electric motor that is provided adjacent to the oil pump in the direction of the rotational axis, and that rotationally drives the pump rotor; a bearing that is rotatably supported by the pump housing; and the pump rotor and the rotor of the electric motor In the electric oil pump device comprising: a metal rotating shaft to be connected; and a control board of a controller that is provided adjacent to the electric motor and controls driving of the electric motor, the rotating axis that houses the electric motor A bottomed cylindrical resin motor housing that opens toward the control board in a direction, and a lid that covers the opening of the motor housing A connector shell of a connector formed on the outside of the bottom of the motor housing with the lid and housing the control board; and a connector integrally provided in the motor housing for connecting the control board and an external power source A terminal portion housed in the connector shell and connected through a through hole formed in the control board, and a plurality of board fixing portions formed in the motor housing and attached to the control board. A metal fastening member that is provided in an insert-molded state on the board fixing portion and that fastens and fixes the control board by screw fastening, and the fastening member is formed from an end surface of the board fixing portion of the motor housing. Projecting toward the control board in the direction of the rotation axis, the control board abuts against the end faces of the plurality of fastening members, and between the end faces of the board fixing portions And summarized in that it has a gap.

According to the above configuration, the metal fastening members are embedded in the plurality of board fixing parts formed outside the bottom part of the motor housing in order to screw the control board of the controller to the motor housing. The connector terminal portion and the fastening member inside the connector shell integrally formed with the motor housing are insert-molded into the motor housing while ensuring the positional accuracy of the fastening member with respect to the connector terminal portion. Thereby, a control board can be assembled | attached accurately with respect to a connector terminal part. As a result, it is possible to reduce the number of manufacturing steps for the integrated electric motor and control board, and to suppress an increase in manufacturing cost. Further, the control board abuts against the seating surfaces of a plurality of metal fastening members that are embedded to protrude from the end face of the board fixing part provided in the motor housing toward the control board side in the axial direction, and the end face of the board fixing part Therefore, the control board can be fixed to the motor housing while maintaining parallelism with a stable fastening force of the screws.

  ADVANTAGE OF THE INVENTION According to this invention, the electric oil pump apparatus which can reduce the manufacturing process of an integrated electric motor and controller and can reduce manufacturing cost can be provided.

1 is a longitudinal sectional view showing a schematic configuration of an electric oil pump device according to an embodiment of the present invention. Sectional drawing which shows the housing structure of the electric motor which looked at FIG. 1 from XX direction. FIG. 3 is a detailed cross-sectional view showing a control board mounting structure.

Hereinafter , embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a schematic configuration of an electric oil pump device according to an embodiment of the present invention. As shown in FIG. 1, an electric oil pump device 1 is used as a hydraulic pump for an automobile transmission, and an oil pump (for example, an internal gear pump) 2 and an electric motor (hereinafter referred to as a brushless motor) that drives the oil pump 2 to rotate. ) 3 are adjacent (unitized). The controller 4 is also incorporated in the motor housing 15. The brushless motor 3 shown in FIG. 1 is a sensorless brushless motor having a three-phase winding connected in a double star connection.

  The oil pump 2 uses a trochoid curved pump here, and an inner rotor for pumps (hereinafter referred to as “outer rotor”) 10 having outer teeth on the inner periphery of a pump outer rotor (hereinafter referred to as “outer rotor”) 10 having inner teeth having trochoidal teeth. (Hereinafter referred to as an inner rotor) 11, and a pump section (pump rotor) in which the outer rotor 10 and the inner rotor 11 are eccentrically disposed in a pump chamber 12 formed between the pump plate 14 and the pump housing 13 so as to be rotatable. Is configured.

Inner rotor 11, the rotary drive shaft (rotary shaft) closer portion to one than the portion forming the rotor 6 in 7 is fitted fixed in (Fig. 1 left), you rotate together with the rotary drive shaft 7. The outer rotor 10 has one more internal tooth than the outer teeth of the inner rotor 11, and is arranged so as to be rotatable in the pump chamber 12 around a position eccentric with respect to the rotation drive shaft 7. Further, the inner rotor 11, with external teeth meshing with a portion of the entire periphery with the internal teeth of the outer rotor 10, the external teeth you rotate while substantially inscribed respectively the entire circumference of each place on the inner surface of the outer rotor 10.

  Therefore, when the rotational drive shaft 7 is rotationally driven by the brushless motor 3, the volume of the gap between the outer rotor 10 and the inner rotor 11 of the oil pump 2 repeatedly expands and contracts during one rotation of the rotational drive shaft 7. A pump operation for sending oil from the import provided in the pump plate 14 leading to these gaps to the out-port is performed.

  The brushless motor 3 includes a rotating motor rotor (hereinafter referred to as “rotor”) 6 and a motor stator (hereinafter referred to as “stator”) 5 fixed to the outside of the outer peripheral surface of the rotor 6. The rotor 6 is formed by arranging, for example, a plurality of permanent magnets 8 along the circumferential direction on the outer peripheral surface of the rotary drive shaft 7. The rotation drive shaft 7 is a rotation shaft that is shared by the brushless motor 3 and the oil pump 2, and both ends thereof are supported by bearings (for example, rolling bearings) 31 and 32 disposed inside the pump housing 13 and the rotor holding member 23. It is pivotally supported.

  In the stator 5, a plurality of inwardly-illustrated teeth of the stator core 9 divided through a slight air gap are arranged outside the outer peripheral surface of the rotor 6. A resin (for example, PPS) insulator 21 for insulating the coil 17 from the stator core 9 is attached to each tooth of the stator core 9 from both ends in the axial direction, and three-phase coils 17 are wound around the stator subassembly. Is forming. The stator 5 is composed of the plurality of stator subassemblies, and each stator subassembly is fastened and fixed by a cylindrical thin metal (for example, iron) collar 22 around the stator subassembly.

  The end of the coil 17 is electrically connected to the bus bar 18. The insulator 21 is molded integrally with the three bus bars 18 that are the drive terminals of the brushless motor 3. Each bus bar 18 extends from the right end portion of the insulator 21 in parallel to the central axis.

  The stator 5, the rotor holding member 23, and the bus bar 18 are molded integrally with the motor housing 15, and the motor housing 15 and the bus bar 18 are sealed with a seal member. The motor housing 15 has a cylindrical shape, has a bottom on the side opposite to the motor, and opens toward the outside in the rotation axis direction (right side in FIG. 1). This opening is covered with a cover (lid) 30.

  In addition, a plurality of nuts (not shown) made of metal (for example, iron, copper, etc.) are arranged in the circumferential direction with respect to the rotation center and embedded in the insulator 21 mounted on the stator core 9 by insert molding. The stator 5 of the brushless motor 3 is fixed by screwing a bolt (not shown) inserted from the pump plate 14 through the pump housing 13 to a nut embedded in the insulator 21.

The pump plate 14 and the pump housing 13 constituting the housing of the oil pump 2 are made of a nonmagnetic material (for example, aluminum die casting). The motor housing 15 and the cover 30 that house the brushless motor 3 and the controller 4 are formed of a resin material (for example, a thermoplastic resin). The housing body of the electric oil pump device 1 includes the pump plate 14, the pump housing 13, the collar 22, the motor housing 15, and a cover 30. Here, the motor housing 15 and the cover 30 form a waterproof cover. The pump housing 13, the collar 22, and the rotor holding member 23 are combined with each other in the direction of the central axis to fix the stator 5 and the rotor 6 of the brushless motor 3.

  Further, in the electric oil pump device 1 of the present embodiment, a control chamber 24 is formed by an opening on the outer side of the bottom of the motor housing 15 (on the side opposite to the motor) and a cover 30 covering the opening. A control board (hereinafter referred to as a board) 28 of the controller 4 for controlling the brushless motor 3 is accommodated in the control chamber 24 and attached to the end faces of a plurality of board fixing parts 25 provided at the bottom of the motor housing 15 by screws. It has been. On the substrate 28, based on the inverter circuit that converts the DC power source into AC and supplies the drive current to each coil 17 of the brushless motor 3, and the rotational position information of the outer rotor 10 detected by a sensor such as a Hall element, A control circuit unit 29 including a control circuit for controlling the inverter circuit is mounted. The inverter circuit constituting the control circuit unit 29 of the controller 4 and electronic components such as a microcomputer, a coil and a capacitor of the control circuit are mounted on both surfaces of the substrate 28.

The bus bar 18 that is a phase output terminal of the brushless motor 3 that is connected to each coil 17 and is insulated and supported by the insulator 21 is inserted into a through hole (through hole) provided in the substrate 28 and controlled on the substrate 28 by soldering. The circuit unit 29 is connected. A connector shell 19 is provided integrally with the motor housing 15 on the side surface of the motor housing 15, and an internal connector pin (terminal portion) 20 is inserted into a through hole provided in the substrate 28 and soldered to the substrate 28. The upper control circuit unit 29 is electrically connected. Incidentally, this connector shell 19, Ru harness connector (not shown) supply separate is connected is mounted.

  Here, the motor housing 15 and the cover 30 both made of a resin material are joined together by spin welding. An annular welding rib is formed on the back surface side of the cover 30 that covers the opening of the motor housing 15. The welding rib is heated and melted while the cover 30 is rotated, and the motor housing 15 is a fixed counterpart. It is welded by pressing against the concave part. Further, the electric oil pump device 1 is assembled by inserting the rotor 6 into the central portion of the motor housing 15 and fixing the pump housing 13 and the pump plate 14 to the mounting stator 5.

  With the above configuration, the drive current controlled by the control circuit unit 29 is supplied to each coil 17 of the brushless motor 3. Thereby, a rotating magnetic field is generated in the coil 17, torque is generated in the permanent magnet 8, and the rotor 6 is rotationally driven. Thus, when the inner rotor 11 is driven to rotate, the outer rotor 10 is driven and rotated, and the gap between the inner teeth of the outer rotor 10 and the outer teeth of the inner rotor 11 is repeatedly expanded and contracted. Pump operation is performed to suck and discharge oil through the port.

  Next, FIG. 2 is a cross-sectional view showing the housing structure of the brushless motor 3 when FIG. 1 is viewed from the XX direction, and FIG. 3 is a detailed cross-sectional view showing the mounting structure of the substrate 28. Here, FIG. 3 shows only a fixed portion of the substrate 28 such as the motor housing 15, and the cover 30 and the internal structure are omitted.

As shown in FIG. 2, a plurality (for example, 2 in this embodiment) of mounting substrates 28 at equal intervals on the inner periphery of the outer side of the cylindrical space (see FIG. 1) of the motor housing 15 opposite to the oil pump 2. The substrate fixing portions 25 having a pitch of 180 ° are formed. An insert nut 26 made of metal (for example, iron, copper, etc.) as a fastening member for screwing the substrate 28 is embedded in the substrate fixing portion 25 by insert molding. A connector shell 19 in which the connector pins 20 are housed is integrally formed on the outer peripheral wall surface of the motor housing 15. The connector pin 20 is molded integrally with the motor housing 15, is disposed at a position of 90 ° in the circumferential direction with respect to the insert nut 26, and has a tip projecting axially into the cylindrical space at the bottom of the motor housing 15. Yes. Here, the motor housing 15 is integrally formed in a state in which the positional accuracy between the insert nut 26 and the connector pin 20 indicated by the arrow in FIG. 2 is ensured. The distal end portions of the connector pins 20 are inserted into the through holes of the substrate 28 and are electrically connected by soldering.

As shown in FIG. 3, the insert nut 26 is mounted so as to protrude slightly from the end surface of the substrate fixing portion 25 in the direction of the substrate 28 (upper side in FIG. 3, the axial direction). Further, the axial height of the substrate fixing portion 25 is formed higher than the outer peripheral end surface of the motor housing 15. And the board | substrate 28 is being fixed by screwing the fastening screw 27 inserted through the through-hole of the board | substrate 28 with the insert nut 26 embed | buried under the board | substrate fixing | fixed part 25. As shown in FIG. At this time, the substrate 28 is in contact with the seat surface of the insert nut 26, and is fixed to the upper side in the axial direction from the outer peripheral end surface of the motor housing 15 with a gap between the substrate 28 and the end surface of the substrate fixing portion 25 .

  Next, the operation and effect of the electric oil pump device 1 according to the present embodiment configured as described above will be described.

According to the above configuration, in the electric oil pump device 1, the brushless motor 3 and the substrate 28 of the controller 4 are arranged adjacent to the oil pump 2 in the axial direction of the rotary drive shaft 7 with respect to the oil pump 2. It is configured. The substrate 28 is accommodated in a control chamber 24 formed outside the bottom of the motor housing 15. A connector shell 19 in which connector pins 20 are housed is integrally formed on the outer peripheral side surface of the motor housing 15. In addition, metal insert nuts 26 are insert-molded in a plurality of substrate fixing portions 25 provided at the bottom of the motor housing 15 to fasten the substrate 28 with screws. The connector pin 20 and the insert nut 26 are insert-molded into the motor housing 15 at the same time while ensuring positional accuracy. Here, the insert nut 26 is embedded so as to slightly protrude from the end face of the board fixing portion 25 of the motor housing 15 toward the board 28 (outside in the axial direction), and the board 28 abuts against the seat surface of the insert nut 26. The substrate fixing portion 25 is fixed by a fastening screw 27 with a gap between the end surface .

Thereby, the connector pin 20 and the insert nut 26 are directly positioned, and the board 28 is accurately positioned with respect to the connector pin 20 with respect to the insert nut 26. Therefore, the connector pin 20 can be easily inserted into the through hole of the board 28. The substrate 28 can be easily assembled to the motor housing 15. As a result, the number of steps for assembling the substrate can be reduced, and an increase in manufacturing cost can be suppressed. Further , since there is no deformation of the resin of the substrate fixing portion 25 due to contact with the substrate 28, the substrate 28 can be fixed to the motor housing 15 while maintaining parallelism with a stable fastening force. Furthermore , since the board 28 is disposed on the outer side in the axial direction from the outer peripheral end face of the motor housing 15, the solder state (fillet) on the back face of the board 28 of the connector pin 20 can be easily confirmed. Thereby, the soldering defect of the board | substrate 28 can be reduced.

  As described above, according to the present embodiment, it is possible to provide an electric oil pump device that can reduce the manufacturing steps of the integrated brushless motor and the substrate and reduce the manufacturing cost.

  Although one embodiment according to the present invention has been described above, the present invention can also be implemented in other forms.

  In the embodiment described above, the two insert nuts 26 are arranged at intervals of 180 ° in the circumferential direction with respect to the rotation center at the bottom of the motor housing 15, and the substrate 28 is fastened with the fastening screws 27. The number and arrangement of the insert nuts 26 are not limited as long as the parallelism of the substrate 28 is ensured and the fastening force of the fastening screw 27 is uniformly regulated.

  Moreover, although the case where the internal gear type pump was used as the oil pump 2 was shown in the said embodiment, it is not limited to this, The rotary pump using a vane drive, an external gear, etc. may be sufficient.

  Furthermore, although the case where the brushless motor 3 is applied to the electric oil pump device 1 has been described in the above embodiment, the present invention is not limited to this, and the brushless motor 3 may be applied to other devices using the same brushless motor 3. Good. Furthermore, a motor with a brush can be applied.

1: electric oil pump device, 2: oil pump, 3: brushless motor (electric motor), 4: controller, 5: stator for motor, 6: rotor for motor, 7: rotary drive shaft (rotary shaft), 8: permanent Magnet: 9: Stator core, 10: Outer rotor for pump, 11: Inner rotor for pump, 12: Pump chamber, 13: Pump housing, 14: Pump plate,
15: Motor housing, 17: Motor coil, 18: Bus bar, 19: Connector shell, 20: Connector pin (terminal part), 21: Insulator, 22: Collar, 23: Rotor holding member, 24: Control room, 25: Board Fixed part, 26: Insert nut, 27: Fastening screw, 28: Board (control board), 29: Control circuit part, 30: Cover (lid), 31, 32: Bearing

Claims (1)

A metal oil pump in which a pump rotor is rotatably supported around a rotation axis in a pump chamber formed between a pump plate and a pump housing;
An electric motor provided adjacent to the oil pump in the direction of the rotation axis and driving the pump rotor;
A metal rotary shaft that is rotatably supported by the pump housing and connects the pump rotor and the rotor of the electric motor;
In an electric oil pump device provided with a control board of a controller that is provided adjacent to the electric motor and drives and controls the electric motor,
A bottomed cylindrical resin motor housing that opens toward the control board in the direction of the rotation axis that houses the electric motor;
A lid covering the opening of the motor housing;
A control chamber that is formed with the lid outside the bottom of the motor housing and houses the control board;
A connector shell of a connector provided integrally with the motor housing and connecting the control board and an external power source;
A terminal portion housed in the connector shell and connected through a through hole formed in the control board;
A plurality of board fixing portions formed on the motor housing and attached to the control board;
A metal fastening member that is provided in an insert-molded state on the board fixing portion, and that fixes the control board by screw fastening; and
The fastening member is provided to protrude from the end face of the board fixing portion of the motor housing toward the control board side in the rotation axis direction, and the control board abuts against end faces of the plurality of fastening members, and the board fixing portion An electric oil pump device characterized by having a gap between the end face of the motor.

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